#!/user/bin/python
# -*- coding: utf-8 -*-


class Student(object):
    def __init__(self, name, score):
        self.__name = name
        self.__score = score
        
    def print_score(self):
        print('%s:%s'%(self.__name, self.__score))    
     
    def get_grade(self):
        if self.__score >= 90:
            return 'A'
        elif self.__score >= 60:
            return 'B'
        else:
            return 'C'    
        
student = Student('wzf', 99)
student.name = 'ljs'
print(student.name)
student.print_score()
print(student.get_grade())

